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NuSTAR reveals the extreme properties of the super-Eddington accreting supermassive black hole in PG 1247+267

Lanzuisi, G. and Harrison, F. A. and Walton, D. J. (2016) NuSTAR reveals the extreme properties of the super-Eddington accreting supermassive black hole in PG 1247+267. Astronomy and Astrophysics, 590 . Art. No. A77. ISSN 0004-6361. doi:10.1051/0004-6361/201628325.

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PG1247+267 is one of the most luminous known quasars at z ~ 2 and is a strongly super-Eddington accreting supermassive black hole (SMBH) candidate. We obtained NuSTAR data of this intriguing source in December 2014 with the aim of studying its high-energy emission, leveraging the broad band covered by the new NuSTAR and the archival XMM-Newton data. Several measurements are in agreement with the super-Eddington scenario for PG1247+267: the soft power law (Γ = 2.3 ± 0.1); the weak ionized Fe emission line; and a hint of the presence of outflowing ionized gas surrounding the SMBH. The presence of an extreme reflection component is instead at odds with the high accretion rate proposed for this quasar. This can be explained with three different scenarios; all of them are in good agreement with the existing data, but imply very different conclusions: i) a variable primary power law observed in a low state, superimposed on a reflection component echoing a past, higher flux state; ii) a power law continuum obscured by an ionized, Compton thick, partial covering absorber; and iii) a relativistic disk reflector in a lamp-post geometry, with low coronal height and high BH spin. The first model is able to explain the high reflection component in terms of variability. The second does not require any reflection to reproduce the hard emission, while a rather low high-energy cutoff of ~100 keV is detected for the first time in such a high redshift source. The third model require a face-on geometry, which may affect the SMBH mass and Eddington ratio measurements. Deeper X-ray broad-band data are required in order to distinguish between these possibilities.

Item Type:Article
Related URLs:
URLURL TypeDescription
Lanzuisi, G.0000-0001-9094-0984
Harrison, F. A.0000-0003-2992-8024
Walton, D. J.0000-0001-5819-3552
Additional Information:© 2016 ESO. Received 17 February 2016. Accepted 21 March 2016. Published online 13 May 2016. We thank the anonymous referee for constructive comments that have helped us to improve the quality of the paper. G.L. thanks F. Gastaldello for useful insights on NuSTAR background issues, E. Dalessandro for advice about HST data, and O. Shemmer for help with the Swift data. G.L. acknowledges financial support from the CIG grant “eEASY” No. 321913 and from ASI-INAF 2014-045-R.0 and ASI/INAF I/037/12/0–011/13 grants. A.C.F. acknowledges support from ERC grant 340442. FEB acknowledges support from CONICYT-Chile (Basal-CATA PFB-06/2007, FONDECYT Regular 1141218, “EMBIGGEN” Anillo ACT1101), the Ministry of Economy, Development, and Tourism’s Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS.W.N.B. and B.L. acknowledges support from Caltech NuSTAR subcontract 44A-1092750. This work made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by NASA. This research also made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA).
Group:Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
European Research Council (ERC)321913 eEasy
Agenzia Spaziale Italiana (ASI)2014-045-R0
Agenzia Spaziale Italiana (ASI)I/037/12/0–011/13
European Research Council (ERC)340442
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1141218
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)ACT1101
Iniciativa Científica Milenio del Ministerio de Economía, Fomento y TurismoIC120009
Caltech NuSTAR subcontract44A-1092750
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2016-57
Record Number:CaltechAUTHORS:20160715-122452015
Persistent URL:
Official Citation:NuSTAR reveals the extreme properties of the super-Eddington accreting supermassive black hole in PG 1247+267 G. Lanzuisi, M. Perna, A. Comastri, M. Cappi, M. Dadina, A. Marinucci, A. Masini, G. Matt, F. Vagnetti, C. Vignali, D. R. Ballantyne, F. E. Bauer, S. E. Boggs, W. N. Brandt, M. Brusa, F. E. Christensen, W. W. Craig, A. C. Fabian, D. Farrah, C. J. Hailey, F. A. Harrison, B. Luo, E. Piconcelli, S. Puccetti, C. Ricci, C. Saez, D. Stern, D. J. Walton and W. W. Zhang A&A, 590 (2016) A77 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69060
Deposited By: Ruth Sustaita
Deposited On:22 Jul 2016 22:29
Last Modified:11 Nov 2021 04:08

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